A water-retaining and viscosity-increasing admixture for wet shotcrete

Abstract

The invention relates to a water retention and viscosity enhancement additive used for wet shotcrete. The water retention and viscosity enhancement additive comprises, by weight, 35-45 parts of sodium polyacrylate, 45-55 parts of an organic polymer binder and 5-12 parts of polyvinyl alcohol. The water retention and viscosity enhancement additive has very good caking and water retention properties, so the recovery rate of the wet shotcrete is reduced in order to make the jet quality be stable, thereby material wastes are avoided; and the water retention and viscosity enhancement additive can improve the dispersibility and the fluidity of a concrete grout in order to improve the uniformity of the wet shotcrete and reduce the porosity, so the mechanical performances of the wet shotcrete are finally improved.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a water-retaining and viscosity-increasing admixture for wet sprayed concrete. Background technique [0002] Shotcrete technology is widely used in geotechnical engineering and surrounding rock support in underground engineering. Practice has proved that compared with cast-in-place concrete, shotcrete is simple and easy to construct. , pouring and tamping are combined into one process, which saves manpower and shortens the construction period. It can also be constructed in a thin-walled structure in a high room or a narrow working area through a conveying hose. At present, concrete spraying technology has been widely used in the support of metallurgy, coal, water conservancy and various underground engineering chambers and roadways. [0003] Shotcrete technology has evolved from dry spraying to tidal spraying and wet spraying. For dry spraying and tidal spraying, d...

AI Technical Summary

Problems solved by technology

[0006] However, ordinary concrete viscosifiers have a mediocre viscosifying effect and cannot meet the dual requirements of wet shotcrete for high water retention and high viscosity

Moreover, during the spraying process of concrete, due to its own gravity, it often causes uneven concrete and high porosity, which seriously affects the mechanical properties of concrete after hardening, while ordinary tackifiers have little effect on improving the mechanical properties of concrete. Not obvious